diff --git a/TravelCostCalculator.java b/TravelCostCalculator.java
index 6f89acb..8e5f54e 100644
--- a/TravelCostCalculator.java
+++ b/TravelCostCalculator.java
@@ -1,3 +1,5 @@
+//EG/2020/4200
+//Senapathy J.D
 import java.io.BufferedReader;
 import java.io.FileReader;
 import java.io.IOException;
@@ -6,68 +8,91 @@
 import java.util.Map;
 
 public class TravelCostCalculator {
-    static Map<String, Double> a = new HashMap<>();
-    static Map<String, Double> b = new HashMap<>();
-    static Map<String, Double> c = new HashMap<>();
+    static Map<String, Double> hashMap1 = new HashMap<>();
+    static Map<String, Double> hashMap2 = new HashMap<>();
+    static Map<String, Double> hashMap3 = new HashMap<>();
 
-    static void l1(String file) throws IOException {
+
+
+    //Function to find hotel rates
+    
+    static void hotelRates(String file) throws IOException {
+    
         BufferedReader reader = new BufferedReader(new FileReader(file));
-        String i; 
-        while ((i = reader.readLine()) != null) {
-            String[] p = i.split(",");
-            a.put(p[0].toUpperCase(), Double.parseDouble(p[1]));
+        
+        while ((theReadingFile = reader.readLine()) != null) {
+            String[] p = theReadingFile.split(",");
+            hashMap1.put(p[0].toUpperCase(), Double.parseDouble(p[1]));
         }
     }
 
-    static void l2(String file) throws IOException {
+    //Function to find exchange rates
+
+    static void exchangeRates(String file) throws IOException {
         BufferedReader reader = new BufferedReader(new FileReader(file));
-        String i;
-        while ((i = reader.readLine()) != null) {
-            String[] p = i.split(",");
-            b.put(p[0].toUpperCase(), Double.parseDouble(p[1]));
+        String theReadingFile;
+        while ((theReadingFile = reader.readLine()) != null) {
+            String[] p = theReadingFile.split(",");
+            hashMap2.put(p[0].toUpperCase(), Double.parseDouble(p[1]));
         }
     }
 
-    static void l3(String file) throws IOException {
+    //Function to find flight costs
+
+    static void flightCosts(String file) throws IOException {
         BufferedReader reader = new BufferedReader(new FileReader(file));
-        String i;
-        while ((i = reader.readLine()) != null) {
-            String[] p = i.split(",");
-            c.put(p[0].toUpperCase(), Double.parseDouble(p[1]));
+        String theReadingFile;
+        while ((theReadingFile = reader.readLine()) != null) {
+            String[] p = theReadingFile.split(",");
+            hashMap3.put(p[0].toUpperCase(), Double.parseDouble(p[1]));
         }
     }
 
     public static void main(String[] args) {
         try {
-            l1("data/hotel_rates.csv");
-            l2("data/exchange_rates.csv");
-            l3("data/flight_costs.csv");
+            
+            //Data sets of hotel rates, exchange rates and flight costs
+            hotelRates("data/hotel_rates.csv");
+            exchangeRates("data/exchange_rates.csv");
+            flightCosts("data/flight_costs.csv");
 
             BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
 
+            //Enter destination
             System.out.print("Enter your destination: ");
             String destination = reader.readLine().toUpperCase();
 
-            double flight_cost = c.getOrDefault(destination, 0.0);
-            double hotel_cost = a.getOrDefault(destination, 0.0);
+            //Getting cost of flight
+            double costOfFlight = hashMap3.getOrDefault(destination, 0.0);
+            //Getting cost of hotel
+            double costOfHotel = hashMap1.getOrDefault(destination, 0.0);
 
+            //Enter duration of stay
             System.out.print("Enter your stay duration in days: ");
-            int stay_duration = Integer.parseInt(reader.readLine());
-            hotel_cost *= stay_duration;
+            int durationOfStay = Integer.parseInt(reader.readLine());
+
+            costOfHotel *= durationOfStay;
+
+            //Calculating the total cost in USD
+            double totalCostInUSD = costOfFlight + costOfHotel;
+
+            System.out.printf("Flight cost: USD %.2f\n", costOfFlight);
 
-            double total_cost_usd = flight_cost + hotel_cost;
+            System.out.printf("Hotel cost (%d days): USD %.2f\n", durationOfStay, costOfHotel);
 
-            System.out.printf("Flight cost: USD %.2f\n", flight_cost);
-            System.out.printf("Hotel cost (%d days): USD %.2f\n", stay_duration, hotel_cost);
-            System.out.printf("Total: USD %.2f\n", total_cost_usd);
+            System.out.printf("Total: USD %.2f\n", totalCostInUSD);
 
-            String[] available_currencies = b.keySet().toArray(new String[0]);
-            System.out.print("Select your currency for final price estimation(" + String.join(", ", available_currencies) + "): ");
-            String selected_currency = reader.readLine();
+            String[] availableCurrencies = hashMap2.keySet().toArray(new String[0]);
 
-            double final_price_local_currency = total_cost_usd * b.get(selected_currency);
+            //Enter preferred currency
+            System.out.print("Select your currency for final price estimation(" + String.join(", ", availableCurrencies) + "): ");
+            String selectedCurrency = reader.readLine();
+            
+            //Calculating the final price in the preferred currency
+            double finalPriceInlocalCurrency = totalCostInUSD * hashMap2.get(selectedCurrency);
 
-            System.out.printf("Total in %s: %.2f\n", selected_currency, final_price_local_currency);
+            //Outputing the final cost
+            System.out.printf("Total in %s: %.2f\n", selectedCurrency, finalPriceInLocalCurrency);
         } catch (IOException e) {
             e.printStackTrace();
         }